image/qemu: Add explict depends for qemu-helper addto_recipe_sysroot task

The populate_sysroot task isn't enough for qemu-helper-native, we need
it's addto_recipe_sysroot task. This corrects what amounts to bad
dependency information to be explicit.

(From OE-Core rev: 55623420208bc4c77a61492d2bbcbc71d3123acd)

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/classes/image.bbclass

@@ -138,7 +138,10 @@ python () {
     def extraimage_getdepends(task):
         deps = ""
         for dep in (d.getVar('EXTRA_IMAGEDEPENDS') or "").split():
-            deps += " %s:%s" % (dep, task)
+            if ":" in dep:
+                deps += " %s " % (dep)
+            else:
+                deps += " %s:%s" % (dep, task)
         return deps
 
     d.appendVarFlag('do_image_complete', 'depends', extraimage_getdepends('do_populate_sysroot'))